<template>
  <span style="margin-right: 10px">
    <input
      style="display: none"
      :class="'input-file' + index"
      type="file"
      @change="exportData"
      accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel"
    />
    <button
      type="primary"
      size="mini"
      icon="el-icon-upload"
      @click="btnClick"
      >导入报告</button
    >
  </span>
</template>
 
<script>
// 引入组件
import XLSX from "xlsx";
export default {
  data() {
    return {};
  },
  props: {
    index: {
      type: String,
      default: "0",
    },
  },
  methods: {
    btnClick() {
      // 点击事件
      document.querySelector(".input-file" + this.index).click();
    },
    exportData(event) {
      if (!event.currentTarget.files.length) {
        return;
      }
      const that = this;
      // 拿取文件对象
      var f = event.currentTarget.files[0];
      // 用FileReader来读取
      var reader = new FileReader();
      // 重写FileReader上的readAsBinaryString方法
      FileReader.prototype.readAsBinaryString = function (f) {
        var binary = "";
        var wb; // 读取完成的数据
        var outdata; // 你需要的数据
        var outhtml; //html类型数据
        var reader = new FileReader();
        reader.onload = function () {
          // 读取成Uint8Array，再转换为Unicode编码（Unicode占两个字节）
          var bytes = new Uint8Array(reader.result);
          var length = bytes.byteLength;
          for (var i = 0; i < length; i++) {
            binary += String.fromCharCode(bytes[i]);
          }
          // 接下来就是xlsx了，具体可看api
          wb = XLSX.read(binary, {
            type: "binary",
          });
          outhtml = XLSX.utils.sheet_to_html(wb.Sheets[wb.SheetNames[0]]);
          // outdata = XLSX.utils.sheet_to_formulae(wb.Sheets[wb.SheetNames[0]]);
          outdata = XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]);
          // 自定义方法向父组件传递数据
          that.$emit("getResult", outdata, outhtml);
        };
        reader.readAsArrayBuffer(f);
      };
      reader.readAsBinaryString(f);
    },
  },
};
</script>
 
<style>
/* .input-file {
  display: none;
} */
</style>